Magnetic channeling of radiatively driven hot-star winds

Stan Owocki, Rich Townsend, Asif Ud-Doula

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Massive, hot, luminous stars have strong stellar winds driven by line-scattering of the star's continuum radiation. Spectropolarimetric observations have detected substantial large-scale dipole magnetic fields for several hot stars. This paper discusses our recent efforts to carry out MHD simulations of the effect of magnetic fields in channeling and confining the wind outflow, with particular emphasis on the "Magnetically Confined Wind Shock" (MCWS) paradigm for explaining the relatively hard X-ray emission observed by the Chandra X-ray observatory for magnetic hot stars like Theta 1 Ori C. We also examine the effect of magnetic fields on the wind from a rotating star, showing that this can spin-up the outflowing material, but does not readily form a Keplerian "Magnetically Torqued Disk". We further describe a new "Rigidly Rotating Magnetosphere"(RRM) model that has proven highly successful in reproducing the rotational modulated Balmer emission seen in magnetic Bp stars like sigma Ori C. We conclude with an outlook for the general role of magnetic fields in structuring hot-star mass loss and circumstellar matter.

Original languageEnglish (US)
Title of host publicationMAGNETIC FIELDS IN THE UNIVERSE
Subtitle of host publicationFrom Laboratory and Stars to Primordial Structures
Pages239-252
Number of pages14
DOIs
StatePublished - Sep 28 2005
EventMAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures - Angra dos Reis, Brazil
Duration: Nov 28 2004Dec 3 2004

Publication series

NameAIP Conference Proceedings
Volume784
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherMAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures
CountryBrazil
CityAngra dos Reis
Period11/28/0412/3/04

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Owocki, S., Townsend, R., & Ud-Doula, A. (2005). Magnetic channeling of radiatively driven hot-star winds. In MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures (pp. 239-252). (AIP Conference Proceedings; Vol. 784). https://doi.org/10.1063/1.2077188